Ok this must be the dumbest question ever.

What is the difference between bipolar and unipolar?

I'm not sure if unipolar is only the top half of the waves, or is the DC bias offset so the lowest point of the graph is 0 instead of some negative amplitude.

This is for a lab where we're writing assembly to control a Digitial to analog chip (and watching the output on the O-scope). The labmanual says to generate:
A Square Wave (both unipolar and bipolar)
A Sawtooth Wave (both unipolar and bipolar)
A Sine Wave (bipolar only)

 

A unipolar wave is one which does not change polarity with time, it does not matter if it is biased or not.

A bipolar is one which changes polarity with time, like a sine wave.

 

So, if bias doesn't matter, and i was to make a unipolar square wave... then do i only create voltages for the O-scope with one polarity (lets say positive only, like the top half), and just don't create any negative voltages so all that's seen on the scope is " - - - " ?

Edit: here i made a picture, is this correct? http://wolfsfiles.googlepages.com/biunipolar.jpg

 

Yes, your signals are correct labeled as unipolars or bipolars.

 

Ok thankyou